Magazine glower-lamp.



No. 673336. Patnted May I4, I901.

- A. J. WURTS.

MAGAZINE GLOWER LAMP.

' (Application filed Apr. 20,1900.

(No Model.)

WITNESSES: IN VENTOI? m: uonms mans c0. mm'ouma. WASHINGTON. n. c.

UNITED STATES PATENT OFFICE.

ALEXANDER JAY WURTS, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO GEORGE WESTINGHOUSE, OF SAME PLACE.

MAGAZIN E G LOWE R-LAM P.

SPECIFICATION formingpart of Letters Patent No. 673,936, dated May 14,

1 901. Application filed April 25, 1900. Serial No. 14,364. (No model.)

ballast-resistance o, a circuit making and breaking device 11, a coil 12, and a coil 10, to a conductor 1.

It will be seen that the coil 9 is so located with reference to the circuit making and breaking device 11 that when energized it will serve to raise the movable member of such device, and thus interrupt the circuit of which it forms a part. It will be seen, also, that the coils 10 and 12 bear the same relation, respectively, to the circuit making and breaking devices '7 and 8.

The operation of the lamp, assuming that the two glowers 3 and 4 will not become conductive at exactly the same instant, is as follows: When the currentis turned on, the circuit making and breaking devices are obviously all closed and the circuit will be between the conductors l and 2 through the heater 6 only. l/Vhen one of the glowers for example, the glower 3-becomes heated to such a point as to become conductive, the current will pass through the coils 10 and 12, the corresponding ballast-resistance 5, and the glower 3. The coils 10 and 12 being thus energized, they will open the circuit-breakers 7 and 8, thus opening the circuit of the heater and that of the glower 4 and holding them open so long as the glower 3 continues to operate. If the glower 3 should become-broken, the interruption of the current would obviously serve to deenergize the coils 10 and 12, and the circuits of the heater and glower 4 would be consequently closed. As soon as the glower 4 becomes conductive the heatercircuit will be interrupted by coil 10 and the lamp will operate as before. The glowers 3 and 4 may be as nearly alike as possible and symmetrically located with reference to the heater, since even under such circumstances they will probably not become conductive at the same instant. It would of course be feasible, if desired, to make the glowers of different efficiency or locate them differently with reference to the heater, so that one [nightinvariably light up before the other.

Referring now to Fig. 2, the glowers 3 and 4, the ballast-resistance 5, and the heater 6 may be substantially the same as in the arrangement shown in Fig. 1, except that the form, size, or composition of the two glowers To all whom it may concern.-

Be it known that I, ALEXANDER JAY WURTs, a citizen of the United States, residing at Pittsburg, in the county of Allegheny I and State of Pennsylvania, have invented a new and useful Improvement in Magazine Glower-Lamps, of which the following is a specification.

Myin vention relates to electric lamps of the type in which the light-emitting part is a nonconductor when cold and becomes a conductor when its temperature is raised to the proper degree by means of independently-generated heat.

The object of myinvention is to so construct a lamp of the type above indicated that a single glower or a single set of glowers only will be in service at any one time; but if a glower or set-of glowers becomes broken by accident or through long service another glower or set of glowers will be automatically put into service to take the place of the glower or set of glowers rendered inoperative. With this object in view I have devised the means illustrated in the accompanying drawings, in which- Figure 1 is a diagram of a lamp and circuits constructed in accordance with my invention, and Fig. 2 is a similar diagram of a modification. Fig.' 3 is a diagram similar to Fig. 1, but showing two sets of glowers in lieu of the two single glowers of Fig. 1.

Referring now particularly to Fig. 1 of the drawings, 1 and 2 are the main conductors of the circuit for supplying the lamp or lamps withenergy, and the single lamp here illustrated as so supplied with energy has two glowers 3 and 4, in series with each of which is a steadying or ballast resistance 5. The glowers 3and4are both located in proximity to a suitable heater 6, adjacent terminals of the two glowers and heater being joined together and to the supply-conductor 2. The other terminal of the heater 6 is connected to the conductor 1 through-a circuit making and breaking device 7. The corresponding terminal of the glower 4 is connected, through its ballast-resistance 5, a circuit making and breaking device 8, a coil 9, and a coil 10, to the conductor 1. The corresponding terminal of the glower 3 is connected, through its or their relative location with reference to the heater shall be such that the glower 3 will first become conductive. This is necessary by reason of the fact that one of the cut-out coils employed in connection with the apparatus shown in Fig. 1 is omitted. In the present case when the glower 3 becomes conductive the current will pass through the coils 10 and 12, and thus serve to open the circuit-breakers 7 and 8 for the heater-circuit and the glower-circuit. In case the glower 3* becomes broken or otherwise inoperative the circuit-breaker 8 will automatically close, thus completing the circuit through the glower 4 The operation is the same as that already described in connection with Fig. 1, except for the fact that the organization shown in Fig. 2 is not adapted for initial lighting up of either glower.

The organization shown in Fig. 3 is the same as that shown in Fig. 1, except that three glowers 3 are connected in parallel as one set in lieu of the single glower 3 of Fig. 1, and three glowers 4 are connected in parallel as one set in lieu of the single glower 4 of Fig. 1. In this case av ballast-resistance 5 for each glower is employed, as usual.

I desire it to be understood that my invention is'not limited to any specific'number of single glowers operated separately or to any specific number of glowers per set where sets are employed in lieu of. single glowers. I desire it to be further understood that my invention is not limited to any specific form of cut-out device or to any specific arrangement of circuits other than may be necessary in order to practice the invention as set forth in the claims.

I claim as my invention 1. A magazine electric lamp of the type de- 40 scribed, comprising a plurality of glowers or sets of glowers and a heater in separate branch circuits and means operated by the current traversing one glower or set of glowers to cut out the heater and the other glowers or sets of glowers.

2. A magazine electric lamp of the type described, comprising a plurality of glowers and a heater in separate branch circuits, and operatingmeans located in one of the glowercircuits and serving to open the heater-circuit and the other glower circuit or circuits when the glower in the first-named circuit becomes conductive.

3. A magazine electric lamp of the type described, com prisinga plurality of glowers and a heater in separate branch circuits, opening and closing devices for the heater-circuit and one or more of the glower-circuits and one or more operating means, said operating means being actuated to open the corresponding circuits by currents in the other glower circuit or circuits.

4. A magazine electric lamp of the type described, comprising a plurality of glowers and a heater in separate branch circuits, a circuit-- breaker in each circuit and an actuating device in each glower-circuit whereby a flow of current through any glower will serve to cut out the other glowers and the heat-er.

In testimony whereof I have hereuto sub- I scribed my name this 21st day of April, 1900.

ALEXANDER JAY WURTS. Witnesses:

WESLEY G. CARR, JAMES B. YOUNG. 

